As I promised I have now started to write up an article or 2 on using the truly awesome WinRT MVVM framework StyleMVVM.
The 1st part of this series (my gut feeling is there will only be 2 parts), is available right now here :
http://www.codeproject.com/Articles/676432/WinRT-StyleMVVM-Demo-1-of-2
In this article I discuss what StyleMVVM gives the average developer that might choose to use it. The article is definately written from an ed user point of view. I think once you have read the article you will see that StyleMVVM is indeed very useful.
Anyway I guess I better start on part 2 now huh.